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linux-next/drivers/pinctrl/bcm/pinctrl-bcm6368.c
Álvaro Fernández Rojas 50554accf7 pinctrl: add a pincontrol driver for BCM6368 
Add a pincontrol driver for BCM6368. BCM6368 allows muxing the first 32
GPIOs onto alternative functions. Not all are documented.

Co-developed-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Link: https://lore.kernel.org/r/20210324081923.20379-17-noltari@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2021-03-29 12:20:08 +02:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for BCM6368 GPIO unit (pinctrl + GPIO)
*
* Copyright (C) 2021 Álvaro Fernández Rojas <noltari@gmail.com>
* Copyright (C) 2016 Jonas Gorski <jonas.gorski@gmail.com>
*/
#include <linux/bits.h>
#include <linux/gpio/driver.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/pinctrl/pinmux.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include "../pinctrl-utils.h"
#include "pinctrl-bcm63xx.h"
#define BCM6368_NUM_GPIOS 38
#define BCM6368_MODE_REG 0x18
#define BCM6368_BASEMODE_REG 0x38
#define BCM6368_BASEMODE_MASK 0x7
#define BCM6368_BASEMODE_GPIO 0x0
#define BCM6368_BASEMODE_UART1 0x1
struct bcm6368_pingroup {
const char *name;
const unsigned * const pins;
const unsigned num_pins;
};
struct bcm6368_function {
const char *name;
const char * const *groups;
const unsigned num_groups;
unsigned dir_out:16;
unsigned basemode:3;
};
struct bcm6368_priv {
struct regmap_field *overlays;
};
#define BCM6368_BASEMODE_PIN(a, b) \
{ \
.number = a, \
.name = b, \
.drv_data = (void *)true \
}
static const struct pinctrl_pin_desc bcm6368_pins[] = {
PINCTRL_PIN(0, "gpio0"),
PINCTRL_PIN(1, "gpio1"),
PINCTRL_PIN(2, "gpio2"),
PINCTRL_PIN(3, "gpio3"),
PINCTRL_PIN(4, "gpio4"),
PINCTRL_PIN(5, "gpio5"),
PINCTRL_PIN(6, "gpio6"),
PINCTRL_PIN(7, "gpio7"),
PINCTRL_PIN(8, "gpio8"),
PINCTRL_PIN(9, "gpio9"),
PINCTRL_PIN(10, "gpio10"),
PINCTRL_PIN(11, "gpio11"),
PINCTRL_PIN(12, "gpio12"),
PINCTRL_PIN(13, "gpio13"),
PINCTRL_PIN(14, "gpio14"),
PINCTRL_PIN(15, "gpio15"),
PINCTRL_PIN(16, "gpio16"),
PINCTRL_PIN(17, "gpio17"),
PINCTRL_PIN(18, "gpio18"),
PINCTRL_PIN(19, "gpio19"),
PINCTRL_PIN(20, "gpio20"),
PINCTRL_PIN(21, "gpio21"),
PINCTRL_PIN(22, "gpio22"),
PINCTRL_PIN(23, "gpio23"),
PINCTRL_PIN(24, "gpio24"),
PINCTRL_PIN(25, "gpio25"),
PINCTRL_PIN(26, "gpio26"),
PINCTRL_PIN(27, "gpio27"),
PINCTRL_PIN(28, "gpio28"),
PINCTRL_PIN(29, "gpio29"),
BCM6368_BASEMODE_PIN(30, "gpio30"),
BCM6368_BASEMODE_PIN(31, "gpio31"),
BCM6368_BASEMODE_PIN(32, "gpio32"),
BCM6368_BASEMODE_PIN(33, "gpio33"),
PINCTRL_PIN(34, "gpio34"),
PINCTRL_PIN(35, "gpio35"),
PINCTRL_PIN(36, "gpio36"),
PINCTRL_PIN(37, "gpio37"),
};
static unsigned gpio0_pins[] = { 0 };
static unsigned gpio1_pins[] = { 1 };
static unsigned gpio2_pins[] = { 2 };
static unsigned gpio3_pins[] = { 3 };
static unsigned gpio4_pins[] = { 4 };
static unsigned gpio5_pins[] = { 5 };
static unsigned gpio6_pins[] = { 6 };
static unsigned gpio7_pins[] = { 7 };
static unsigned gpio8_pins[] = { 8 };
static unsigned gpio9_pins[] = { 9 };
static unsigned gpio10_pins[] = { 10 };
static unsigned gpio11_pins[] = { 11 };
static unsigned gpio12_pins[] = { 12 };
static unsigned gpio13_pins[] = { 13 };
static unsigned gpio14_pins[] = { 14 };
static unsigned gpio15_pins[] = { 15 };
static unsigned gpio16_pins[] = { 16 };
static unsigned gpio17_pins[] = { 17 };
static unsigned gpio18_pins[] = { 18 };
static unsigned gpio19_pins[] = { 19 };
static unsigned gpio20_pins[] = { 20 };
static unsigned gpio21_pins[] = { 21 };
static unsigned gpio22_pins[] = { 22 };
static unsigned gpio23_pins[] = { 23 };
static unsigned gpio24_pins[] = { 24 };
static unsigned gpio25_pins[] = { 25 };
static unsigned gpio26_pins[] = { 26 };
static unsigned gpio27_pins[] = { 27 };
static unsigned gpio28_pins[] = { 28 };
static unsigned gpio29_pins[] = { 29 };
static unsigned gpio30_pins[] = { 30 };
static unsigned gpio31_pins[] = { 31 };
static unsigned uart1_grp_pins[] = { 30, 31, 32, 33 };
#define BCM6368_GROUP(n) \
{ \
.name = #n, \
.pins = n##_pins, \
.num_pins = ARRAY_SIZE(n##_pins), \
}
static struct bcm6368_pingroup bcm6368_groups[] = {
BCM6368_GROUP(gpio0),
BCM6368_GROUP(gpio1),
BCM6368_GROUP(gpio2),
BCM6368_GROUP(gpio3),
BCM6368_GROUP(gpio4),
BCM6368_GROUP(gpio5),
BCM6368_GROUP(gpio6),
BCM6368_GROUP(gpio7),
BCM6368_GROUP(gpio8),
BCM6368_GROUP(gpio9),
BCM6368_GROUP(gpio10),
BCM6368_GROUP(gpio11),
BCM6368_GROUP(gpio12),
BCM6368_GROUP(gpio13),
BCM6368_GROUP(gpio14),
BCM6368_GROUP(gpio15),
BCM6368_GROUP(gpio16),
BCM6368_GROUP(gpio17),
BCM6368_GROUP(gpio18),
BCM6368_GROUP(gpio19),
BCM6368_GROUP(gpio20),
BCM6368_GROUP(gpio21),
BCM6368_GROUP(gpio22),
BCM6368_GROUP(gpio23),
BCM6368_GROUP(gpio24),
BCM6368_GROUP(gpio25),
BCM6368_GROUP(gpio26),
BCM6368_GROUP(gpio27),
BCM6368_GROUP(gpio28),
BCM6368_GROUP(gpio29),
BCM6368_GROUP(gpio30),
BCM6368_GROUP(gpio31),
BCM6368_GROUP(uart1_grp),
};
static const char * const analog_afe_0_groups[] = {
"gpio0",
};
static const char * const analog_afe_1_groups[] = {
"gpio1",
};
static const char * const sys_irq_groups[] = {
"gpio2",
};
static const char * const serial_led_data_groups[] = {
"gpio3",
};
static const char * const serial_led_clk_groups[] = {
"gpio4",
};
static const char * const inet_led_groups[] = {
"gpio5",
};
static const char * const ephy0_led_groups[] = {
"gpio6",
};
static const char * const ephy1_led_groups[] = {
"gpio7",
};
static const char * const ephy2_led_groups[] = {
"gpio8",
};
static const char * const ephy3_led_groups[] = {
"gpio9",
};
static const char * const robosw_led_data_groups[] = {
"gpio10",
};
static const char * const robosw_led_clk_groups[] = {
"gpio11",
};
static const char * const robosw_led0_groups[] = {
"gpio12",
};
static const char * const robosw_led1_groups[] = {
"gpio13",
};
static const char * const usb_device_led_groups[] = {
"gpio14",
};
static const char * const pci_req1_groups[] = {
"gpio16",
};
static const char * const pci_gnt1_groups[] = {
"gpio17",
};
static const char * const pci_intb_groups[] = {
"gpio18",
};
static const char * const pci_req0_groups[] = {
"gpio19",
};
static const char * const pci_gnt0_groups[] = {
"gpio20",
};
static const char * const pcmcia_cd1_groups[] = {
"gpio22",
};
static const char * const pcmcia_cd2_groups[] = {
"gpio23",
};
static const char * const pcmcia_vs1_groups[] = {
"gpio24",
};
static const char * const pcmcia_vs2_groups[] = {
"gpio25",
};
static const char * const ebi_cs2_groups[] = {
"gpio26",
};
static const char * const ebi_cs3_groups[] = {
"gpio27",
};
static const char * const spi_cs2_groups[] = {
"gpio28",
};
static const char * const spi_cs3_groups[] = {
"gpio29",
};
static const char * const spi_cs4_groups[] = {
"gpio30",
};
static const char * const spi_cs5_groups[] = {
"gpio31",
};
static const char * const uart1_groups[] = {
"uart1_grp",
};
#define BCM6368_FUN(n, out) \
{ \
.name = #n, \
.groups = n##_groups, \
.num_groups = ARRAY_SIZE(n##_groups), \
.dir_out = out, \
}
#define BCM6368_BASEMODE_FUN(n, val, out) \
{ \
.name = #n, \
.groups = n##_groups, \
.num_groups = ARRAY_SIZE(n##_groups), \
.basemode = BCM6368_BASEMODE_##val, \
.dir_out = out, \
}
static const struct bcm6368_function bcm6368_funcs[] = {
BCM6368_FUN(analog_afe_0, 1),
BCM6368_FUN(analog_afe_1, 1),
BCM6368_FUN(sys_irq, 1),
BCM6368_FUN(serial_led_data, 1),
BCM6368_FUN(serial_led_clk, 1),
BCM6368_FUN(inet_led, 1),
BCM6368_FUN(ephy0_led, 1),
BCM6368_FUN(ephy1_led, 1),
BCM6368_FUN(ephy2_led, 1),
BCM6368_FUN(ephy3_led, 1),
BCM6368_FUN(robosw_led_data, 1),
BCM6368_FUN(robosw_led_clk, 1),
BCM6368_FUN(robosw_led0, 1),
BCM6368_FUN(robosw_led1, 1),
BCM6368_FUN(usb_device_led, 1),
BCM6368_FUN(pci_req1, 0),
BCM6368_FUN(pci_gnt1, 0),
BCM6368_FUN(pci_intb, 0),
BCM6368_FUN(pci_req0, 0),
BCM6368_FUN(pci_gnt0, 0),
BCM6368_FUN(pcmcia_cd1, 0),
BCM6368_FUN(pcmcia_cd2, 0),
BCM6368_FUN(pcmcia_vs1, 0),
BCM6368_FUN(pcmcia_vs2, 0),
BCM6368_FUN(ebi_cs2, 1),
BCM6368_FUN(ebi_cs3, 1),
BCM6368_FUN(spi_cs2, 1),
BCM6368_FUN(spi_cs3, 1),
BCM6368_FUN(spi_cs4, 1),
BCM6368_FUN(spi_cs5, 1),
BCM6368_BASEMODE_FUN(uart1, UART1, 0x6),
};
static int bcm6368_pinctrl_get_group_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(bcm6368_groups);
}
static const char *bcm6368_pinctrl_get_group_name(struct pinctrl_dev *pctldev,
unsigned group)
{
return bcm6368_groups[group].name;
}
static int bcm6368_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
unsigned group, const unsigned **pins,
unsigned *num_pins)
{
*pins = bcm6368_groups[group].pins;
*num_pins = bcm6368_groups[group].num_pins;
return 0;
}
static int bcm6368_pinctrl_get_func_count(struct pinctrl_dev *pctldev)
{
return ARRAY_SIZE(bcm6368_funcs);
}
static const char *bcm6368_pinctrl_get_func_name(struct pinctrl_dev *pctldev,
unsigned selector)
{
return bcm6368_funcs[selector].name;
}
static int bcm6368_pinctrl_get_groups(struct pinctrl_dev *pctldev,
unsigned selector,
const char * const **groups,
unsigned * const num_groups)
{
*groups = bcm6368_funcs[selector].groups;
*num_groups = bcm6368_funcs[selector].num_groups;
return 0;
}
static int bcm6368_pinctrl_set_mux(struct pinctrl_dev *pctldev,
unsigned selector, unsigned group)
{
struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
struct bcm6368_priv *priv = pc->driver_data;
const struct bcm6368_pingroup *pg = &bcm6368_groups[group];
const struct bcm6368_function *fun = &bcm6368_funcs[selector];
int i, pin;
if (fun->basemode) {
unsigned int mask = 0;
for (i = 0; i < pg->num_pins; i++) {
pin = pg->pins[i];
if (pin < BCM63XX_BANK_GPIOS)
mask |= BIT(pin);
}
regmap_update_bits(pc->regs, BCM6368_MODE_REG, mask, 0);
regmap_field_write(priv->overlays, fun->basemode);
} else {
pin = pg->pins[0];
if (bcm6368_pins[pin].drv_data)
regmap_field_write(priv->overlays,
BCM6368_BASEMODE_GPIO);
regmap_update_bits(pc->regs, BCM6368_MODE_REG, BIT(pin),
BIT(pin));
}
for (pin = 0; pin < pg->num_pins; pin++) {
struct pinctrl_gpio_range *range;
int hw_gpio = bcm6368_pins[pin].number;
range = pinctrl_find_gpio_range_from_pin(pctldev, hw_gpio);
if (range) {
struct gpio_chip *gc = range->gc;
if (fun->dir_out & BIT(pin))
gc->direction_output(gc, hw_gpio, 0);
else
gc->direction_input(gc, hw_gpio);
}
}
return 0;
}
static int bcm6368_gpio_request_enable(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range,
unsigned offset)
{
struct bcm63xx_pinctrl *pc = pinctrl_dev_get_drvdata(pctldev);
struct bcm6368_priv *priv = pc->driver_data;
if (offset >= BCM63XX_BANK_GPIOS && !bcm6368_pins[offset].drv_data)
return 0;
/* disable all functions using this pin */
if (offset < BCM63XX_BANK_GPIOS)
regmap_update_bits(pc->regs, BCM6368_MODE_REG, BIT(offset), 0);
if (bcm6368_pins[offset].drv_data)
regmap_field_write(priv->overlays, BCM6368_BASEMODE_GPIO);
return 0;
}
static struct pinctrl_ops bcm6368_pctl_ops = {
.dt_free_map = pinctrl_utils_free_map,
.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
.get_group_name = bcm6368_pinctrl_get_group_name,
.get_group_pins = bcm6368_pinctrl_get_group_pins,
.get_groups_count = bcm6368_pinctrl_get_group_count,
};
static struct pinmux_ops bcm6368_pmx_ops = {
.get_function_groups = bcm6368_pinctrl_get_groups,
.get_function_name = bcm6368_pinctrl_get_func_name,
.get_functions_count = bcm6368_pinctrl_get_func_count,
.gpio_request_enable = bcm6368_gpio_request_enable,
.set_mux = bcm6368_pinctrl_set_mux,
.strict = true,
};
static const struct bcm63xx_pinctrl_soc bcm6368_soc = {
.ngpios = BCM6368_NUM_GPIOS,
.npins = ARRAY_SIZE(bcm6368_pins),
.pctl_ops = &bcm6368_pctl_ops,
.pins = bcm6368_pins,
.pmx_ops = &bcm6368_pmx_ops,
};
static int bcm6368_pinctrl_probe(struct platform_device *pdev)
{
struct reg_field overlays = REG_FIELD(BCM6368_BASEMODE_REG, 0, 15);
struct device *dev = &pdev->dev;
struct bcm63xx_pinctrl *pc;
struct bcm6368_priv *priv;
int err;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
err = bcm63xx_pinctrl_probe(pdev, &bcm6368_soc, (void *) priv);
if (err)
return err;
pc = platform_get_drvdata(pdev);
priv->overlays = devm_regmap_field_alloc(dev, pc->regs, overlays);
if (IS_ERR(priv->overlays))
return PTR_ERR(priv->overlays);
return 0;
}
static const struct of_device_id bcm6368_pinctrl_match[] = {
{ .compatible = "brcm,bcm6368-pinctrl", },
{ /* sentinel */ }
};
static struct platform_driver bcm6368_pinctrl_driver = {
.probe = bcm6368_pinctrl_probe,
.driver = {
.name = "bcm6368-pinctrl",
.of_match_table = bcm6368_pinctrl_match,
},
};
builtin_platform_driver(bcm6368_pinctrl_driver);
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